Evaluation of Minimum, Maximum and Optimum Source Temperature for Solar-Powered Adsorption Refrigeration System
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RESEARCH ARTICLE-MECHANICAL ENGINEERING
Evaluation of Minimum, Maximum and Optimum Source Temperature for Solar-Powered Adsorption Refrigeration System Nitin D. Banker1
· Devendra Dandotiya2 · Sai Vamsi Reddy Morthala3 · Mahesh Gaddam3 · Sridhar Kakileti3
Received: 20 March 2020 / Accepted: 13 August 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract Due to the utilization of solar thermal energy and environmentally friendly nature, globally there is a huge thrust toward the development of vapor adsorption refrigeration systems. Indeed, it is necessary to identify the minimum, maximum and optimum temperatures of heat source for solar-powered adsorption systems. With this objective, the presented paper focuses on the evaluation of lower, upper and optimum temperatures of the heat source to run the adsorption refrigeration system. Performance parameters, cooling capacity and coefficient of performance (COP), have been utilized to derive the limits of source (desorption) temperatures and applied to two different adsorbent–adsorbate pairs, namely Maxsorb III–ethanol and Maxsorb III– R134a. The adsorption and evaporator temperatures considered for the analysis are 25–40 °C and − 10–10 °C, respectively. Keywords Adsorption refrigeration system · Cooling capacity · COP · Desorption temperature
List of symbols A C Cp E h m ˙ m n P Q q R T V W
B
Adsorption potential (J/mol) Specific adsorbance Specific heat at constant pressure (kJ/kg K) Characteristic energy of adsorption system (J/mol) Specific enthalpy (kJ/kg) Mass flow rate (kg/s) Mass (kg) Structural heterogeneity parameter Pressure (Pa) Heat (kJ) Heat flow rate (kW) Universal gas constant (J/mol K) Temperature (°C) Compressor volume (m3 ) Power (kW) Nitin D. Banker [email protected]
1
School of Engineering and Applied Science, Ahmedabad University, Gujarat 380009, India
2
Department of Mechanical Engineering, Presidency University, Bangalore, Karnataka 560064, India
3
Department of Mechanical Engineering, Shiv Nadar University, Dadri, UP 201314, India
Z Zo η ρ τ υ
Adsorbed volume (m3 /kg) Limiting volume of adsorption (m3 /kg) Efficiency Density (kg/ m3 ) Time (s) Specific volume (m3/kg)
Subscripts a ac ad ads al air b bo c com cr d des eff f fa
Point ‘a’ on adsorption cycle Activated carbon Adsorbate Adsorption Aluminum Air Point ‘b’ on adsorption cycle Boiling Point ‘c’ on adsorption cycle Compressor Critical Point ‘d’ on adsorption cycle Desorption Effective Fuel Fuel and air mixture
123
Arabian Journal for Science and Engineering
ref s
Refrigerant Saturation
1 Introduction Today, refrigeration has become one of the primary needs of human beings. Plenty of applications, such as space cooling/heating, preservation of medicines, electronics cooling, and preservation of food items, needs refrigeration [1]. Majorly, it is produced using the vapor compression refrigeration system (VCRS) driven by electrical energy [2]. One of the reports states that 15% of the world’s electricity is consumed by refrigeration processes [3].
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